Fixing Mac CI

Author: gershnik

.github/workflows/test.yml

@@ -26,7 +26,7 @@ jobs:
       fail-fast: false
       matrix:
         include:
-        - os: macos-latest
+        - {os: macos-latest, version: 16.0 }
         - os: windows-latest
         - {os: ubuntu-latest, compiler: gcc, version: 11 }
         - {os: ubuntu-latest, compiler: gcc, version: 12 }
@@ -64,6 +64,9 @@ jobs:
             echo "CXX=g++-${{ matrix.version }}" >> $GITHUB_ENV
           fi
         fi
+        if [[ '${{ matrix.os }}' == macos-* ]]; then
+            echo "DEVELOPER_DIR=/Applications/Xcode_-${{ matrix.version }}.app" >> $GITHUB_ENV
+        fi
 
     - name: Configure
       shell: bash